Portable form vibrator



Jan. 2, 1 940. J KSON v 2,185,850

PORTABLE FORM VIBRATOR Filed Dec. 29, 1937 20515 1 20 I v f i m ATT Patented Jan. 2, 1940 new . 2,185,859 PORTABLE FORM ,VIBRATOR Corwill Jackson, Ludington, lVIich.

Application December 29, 1937, Serial No. 182,263

Claims.

' This invention relates to improvements in portableform vibrators. 1

The main objects of this invention are:

First, to. provide a concrete form vibrator which i 5 has a very wide range of uses.

Second, to provide a portable vibrator which may be easily adjusted for a wide varietyof usesor example, in the vibrating of the forms of conduits, columns, walls or the like.

may be quickly and easily adjusted to the form to be vibrated and, if desired, clamped thereto for imparting vibrations uniformly to a form of large dimensions.

Fourth, to provide a portable vibrator havin these advantages which is simple in structure and very easily manipulated.

Objects relating to details and economies of the invention will appear from the description to follow. The invention is defined and pointed out in the claims. 1 r I A preferred embodiment of the invention isillustrated in the accompanying drawing,- in

which: Fig. l is a fragmentary perspective viewof my improved portable vibrator shown in operative relationto a conventionally illustrated conduit form, a second position of adjustment being illustrated by dotted lines.

Fig. 2 is an enlarged fragmentary view partially in section on line 2-2 of Fig. 3.

Fig. 3 is a fragmentary view partially in section on line 33 of Fig. 2.

Fig. 4 is a detail section illustrating the mount- .35 ing of one of the vibratory member supporting arms.

Fig. 5 is a detail view partially in section illustrating details of the mounting for the'vibratory member.

In the embodiment of my invention illustrated,

I provide a wheeled carriage I having wheels 2 at its front end preferably rubber-tired. Legs 3 are provided at the rear end of the carriage, these legs being of advantage in stabilizing the carriage T when it is positionedthat is, tending to hold it in its adjusted position. The carriage is moved about and adjusted by means of the handle 4.

A motor 5, in the embodiment illustrated an internal combustion engine, is mounted on the carriage, the embodiment illustrated being provided with a starting lever 6. As the details of the motor and starting means form no part of ,this invention, they are not detailed or further described herein. I v 5 At each side of the motor, the carriage is pro- Third, to provide a portable vibrator which thereto.

(fol. 259-1 vided with upwardly projecting brackets 1 on which I pi'votally mount the arms 8 forvertical swinging adjustment. To secure the arms in their adjusted position, the uprights are provided I withbrackets 9 having slots ill therein receiving :5 the bolts ii. In Fig. 4, it will be noted that the arms are provided with sockets I2 which engage the conical bushings [3 on the bolts l4.

-At the outer end of the arms I mount the i forked bracket 55, the bracket being tiltably 10 mounted on the arms" at I6. The arms of these brackets carry the rods I! and it having sleeves 3 i9, the sleeves beingprovided with spaced pairs of flanges 2G positioning the straps 2!. The. bolt or rod 2? is engaged in slots 22 in the armsls'o that I the amps may be tensioned. To these straps I clamp the crosshead 23 to which the base 2 5 of the-rotor housing 25 is bolted. Within this rotor housing is an unbalanced rotor 26, the

shaft 2'5 ofwhich is provided withthe V-pulleya20 23 driven from the motor through the belt 29. A-guard 36 is preferably provided for the belt 29 and" also a guard 3i for the vibrating member just described. a a 1 The crosshead 23 has a pair of abutment plates 25 32 pivotally mounted thereon, the pivots 33 for theseabutment members being disposed vertically. It will be noted that the arms 34 on the abutment plates and the arms 35 on the cross- "head have shouldered engagement providing a ,3,0

thrust'surfa'ce for the abutment plates and relieving the pivot' bolts 33 of some of the strain to which they would otherwise besubjected under the vibrations of the vibratory member.

These pivots 33 are provided with springs 36:35-

. which serve to retain the plates in their adjusted positions-that is,'prevent their freeswinging about while permitting them to swing to a position to effectively engage the side of a form shown at 31sec Figs. 1 and 2.

This manner of supporting the vibratory member permits high frequency vibrations thereof "with very little transmission of the vibrations to the vibratory member support and carriage.

.In Fig; 1, I -illustrate my machine in operatives,

relation to a conduit form and as being clamped Efiecti've results, howeven'may be had without clamping to the formthat is, the machine may be positioned with the abutment mem- .bers against the form and easily held in that 50 position manually without the operator being subjected to disagreeable or. injurious vibrations.

The clamping means illustrated comprise a chainor cable made of sections 38and 39, and. a

crosshead or vibratory member having hooks 40 55.-

substantial face to the form.

at its ends with which one end of the cable sections may be engaged.

To easily tighten the cable, I provide a tightening or tensioning means consisting of the block 4| having a screw 42 threaded therein, the screw being adapted to receive a wrench at 43. The screw has a swiveled hook 44 on one end thereof with which the cable section 38 is engaged. The block has a hook 45 with which the cable section 39 may be engaged. The block has a suspending cable 46 provided with a form engaging hook or hanger 47.

In an adjusting to a form, the carriage is moved into position and the arms 8 adjusted to support the vibratory member at the desired elevation and the bracket l5 adjusted to properly present the abutment plates to the formthat is, to bring them to a vertical position in the event the form is vertical. The cable is then positioned as illustrated in Fig. 1 and this can be done with the parts in such position as may be easily engaged and screw adjusted to securely clamp the vibratory member with its foot plates or abutments firmly against the side of the form. The pivotal mounting of the abutment plates enables them to be adjusted so as to present a The machine is then started and high frequency vibrations are imparted throughout the full diameter of the form. The axis of the unbalancing rotor is preferably disposed horizontally as this is found to avoid any nodes or zones of varying vibration.

My machine is capable of a very wide range of use in vibrating wall forms, columns, conduit forms and various other uses. It is particularly desirable in field work-for example, where large conduits are molded in order to minimize transportation; The machine can be moved from form to form where it is desired to cast or mold the units adjacent the point where they are to be laid. By providing the carriage, the vibrating device is readily transported from place to place and it is so supported that it may be adjusted to the form with a minimum of labor on the part of the workmen.

I have illustrated and described my improvements in an embodiment which I have found highly practical. I have not attempted to illustrate and describe various modifications and embodiments which I contemplate as it is believed that this disclosure will enable those skilled in the art to embody or adapt my improvements as may be desired.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent, is:

1. In a portable form vibrator, 'the combination with a carriage provided with wheels at its front end and with legs at its rear end and with handles whereby it may be manipulated on said wheels, of a motor on said carriage, supporting uprights at the sides of said motor, arms mounted on said uprights for pivotal vertically swingingadjustment, means for supporting said arms in their adjusted position on said uprights, a

bracket mounted on the outer ends of said arms for vertical pivotal adjustment, said bracket having vertically spaced cross pieces, a vibratory member having an unbalanced rotor thereon disposed with its axis horizontally, flexible supporting means for said vibratory member extending between said cross pieces, abutment plates pivotally mounted on said vibratory member, and a flexible driving connection for said motor to said rotor.

2. In a portable form vibrator, the combination with a carriage, of a motor on said carriage, arms adjustably mounted on said carriage for vertically swinging adjustment, means for supporting said arms in their adjusted position, a bracket mounted on the other end of said arms for vertical pivotal adjustment, said bracket having vertically spaced cross pieces, one of said cross pieces being mounted for adjustment to and from the other, a vibratory member provided with a form abutment and having an unbalanced rotor thereon, a flexible supporting strap for said vibratory member extending between said cross pieces, and a driving connection for said motor to said rotor.

3. In a portable form vibrator, the combination with a carriage, of amotor on said carriage, arms adjustably mounted on said carriage for vertically swinging adjustment, means for supporting said arms in their adjusted position, a

bracket mounted on the other end of said arms for vertical pivotal adjustment, a vibratory member provided with a form abutment and having an unbalanced rotor thereon, a flexible supporting strap for said vibratory member car-.

ried by said bracket, and a driving connection for said motor to said rotor.

4. In a form vibrator, the combination with a portable support, of a motor on said support, an

arm-mounted on said support for vertical swing-.

ing adjustment and provided with means for securing it in its adjusted positions, a vibratory member support mounted on the swinging end of said arm for til-ting adjustment, a vibratory member mounted on said vibratory member sup-;

port on said arm for vibrating movement independent of said support and having an unbalbalanced rotor mounted thereon with its axis horizontally, and means for clamping said vibratory member to a form comprising a form embracing cable.

CORWILL JACKSON. 

